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. UNTTED STATES FATENT FFTQT.

J. H. BOARDMAN. OF NEV YORK, N. Y.

STEAM-BOILER.

Specification of Letters Patent No. 29,355, dated July 31, 1860.

To all whom it may concern:

Be it known that I, J. H. BOARDMAN, of the city, county, and State ofNew York, have invented certain new and useful Improvements inSteam-Boilers; and I do hereby declare that the following is a full,clear, and exact description of the same, reference being had to theaccompanying drawing, forming a. part of this specification, in which-Figure l represents a longitudinal vertical section of my invention, theline a", fc, Fig. 2, indicating the plane of section. Fig. 2 is atransverse vertical section of ditto taken in the plane indicated by theline y, y, Fig. l. Fig. 3 is a detached plan of my dra-ft regulator andflue cleaner.

Similar letters of reference in the three views indicate correspondingparts.

This invention consists first in the arrangement of a central neckconnecting a horizontal plain, cylinder boiler and a vertical tubularboiler in combination with a fine, surrounding said vertical boiler insuch a manner that the vertical cylinder shall be suspended when set andthe heat from the furnace passes under the horizontal boiler, whichforms the top or covering of the furnace, thence down through and aroundthe vertical boiler, whereby a large amount of heating surface isobtained at a small expense; second in the combination with the'vertical tubular boiler of a mud box in such a manner that theimpurities which precipitate from the water collect in said mud box fromwhence they can be easily removed by blowing out the water.

To enable those skilled in the art to make and use my invention I willproceed to describe its construction and operation with reference to thedrawing.

A, represents a plain cylinder boiler which forms the covering of thefurnace and is supported by the brick work B, and which is heated by are in the furnace C. The grate D consists of a series of semi circulartroughs, arranged in such a manner, that they can be filled with oil, ifit is desired to use such as fuel instead of coal.

The boiler A, connects by means of a round cylindrical neck E, with avertical cylindrical boiler F, which passes down through the flue G.Heating tubes H, run in a vertical direction through the boiler F, andthe flame or heat from the re passes down through these tubes, andaround the vertical boiler F, to the bottom flue I, and through thisfiue to the smoke stack J, as clearly indicated by the arrows in Fig. l.It will be noticed that the heating tubes H, are arranged all around theconnecting` tube or neck E, so that an equal amount of heat, passesthrough every part of the vertical boiler, and at the same time by meansof the drop iiue G, the outer surface of said vertical boiler isrendered available as heating surface, which gives me the greatadvantages of producing with little material a very large amount ofheating surface.

The vertical boiler F, is arranged with a mud box K, in the center ofthe lower tube sheeta', and 'the feed water is conducted to this boilerthrough a pipe b, in the side of the mud box. A pipe c, passing from thebottom of said box serves to blow 0E the contents of the boiler. The mudbox receives all the sediment which precipitates from the water in theboiler and which would otherwise settle in among the tubes H. Hand holesmay be made in said mud box and in the lower part of the tubularcylinder. The annular' flue G, is made sufficiently large for flame tolive in except at the bottom and near to the lower edge of the boiler F,when it is contracted as clearly shown in F l and 2, in the drawing. Bythis arrangement the flame from the fire is allowed to pass down intothe fiue G, as well as into the tubes H, and the outside surface of saidvertical boiler is rendered available as fire surface as Well as thesurface of the heating tubes themselves. Viithout contracting 'the flueG, at the bottom and if it had the same width all the way down, which ithas on 'the top, the draft would be completely diverted from the heatingtubes H, and the actual heating surface of the boiler would thereby bematerially reduced; and if said flue would be continued all the way upof the same width, which it has on the bottom the flame from the furnacecould not pass down through the same and the eHect of the outer surfaceof the boiler as actual heating surface would be materially reduced. Thecontraction of the flue G, at the bottom ought to be such that the draftpassing through said flue is in the same proportion to the outer surfaceof the vertical boiler in which the draft passing through the heatingtubes is to 'the outer surface of said heating tubes.v

In order to facilitate the adjustment of the draft to the properproportion as above indicated, I have placed in the bottom of the flue'Gr, two semi-circular plates L, whichv are operated from the outside ofthe brick wall by means of handles or rods d. The edges of these platesare scalloped as clearly shown in Fig. 3, and they embrace the verticalboiler F, so 'that by drawing out or pushing in said plates the lowerend of the flue G, can be enlarged to free it from ashes or cinders andthen contracted as occasion may require. By cutting into the edges ofsaid plates a series of half circular notches e, (see Fig. 8) equal inarea to the area of the cross-sections of the heating tubes H.

The proper regulation of the draft is greatly facilitated, and by makingthe plates movable, they can be easily freed from any substance thatwould clog them. The tube sheets a a, of the vertical boiler F, areslightly bowed out, not enough however to interfere with the verticalposition of the heating tubes H. The object of this arrangement is toobtain a more free passage of the steam and water up into the horizontalboiler A, and also to facilitate the passage of the sediment down intothe mud box K. The bowing up of the upper and the bowing down of thelower tube sheet renders it necessary to make the heating tubes ofslightly increased length as they approach the center, but they can befastened in avertical position in the' slightly arched tube sheets withequal facility as they can in flat tube sheets.

The vertical cylinder boiler F, is suspended from the cylindrical neckE, without any other support so that the fire can play freely all aroundthe outer surface of said boiler, and that the entire surface of thesame is rendered available as heating surface. At the same time freeaccess can thus be had to the whole under surface of the boiler F,whereby the clearing of the same is greatly facilitated. A door e, inthe brick work B, gives access to the bottom flue I, and to the lowersurface of the boiler F. Furthermore, by leaving said boiler withoutsupport at its bottom, it is left free to expand or to contract andthere is no danger that the joints connecting the two boilers willbecome loose from this cause or that by the eXpansion of the verticalboiler the position of the horizontal boiler is disturbed.

The large amount of heating surface which I obtain by the arrangement ofthe flue Gr, heating tubes H, and the vertical boiler F, with acomparatively small expenditure of material enables me to build myboiler cheaper than a plain cylinder or flue boiler with the sameheating surface and my boiler is also very economical in its use as itrequires but little fuel in proportion to the steam which it produces,and is much more safe than common horizontal and upright tubular boilerson account of its carrying a very large quantity of water on the tubing,and it requires no more room or space than ordinary tubular boilers. Itis also more safe on account of the sparks and cinders being unable torise from the bottom of the chimney flue I, when they are carried by thedraft and their own gravitation. By introducing atmospheric air into theupper part of the furnace and into the drop iue Gr, the smoke andcombustible gases are consumed much more efectually than in commonboilers.

Having thus fully described my invention what I claim as new'and desireto secure by Letters Patent, is;

l. The arrangement and combination of the circular central neck E,horizontal boiler A, vertical tubular boiler F, and surrounding dropflue G, operating substantially as and for the purpose set forth.

2. The combination with the vertical tubular boiler F, of a mud box K,constructed and operating substantially in the manner and for thepurpose specified.

QI. H. BOARDMAN.

Witnesses:

M. M. LIVINGSTON, JNO. H. Soo'r'r.

